Issue link: https://read.dmtmag.com/i/34500
ROLLOVER THRESHOLD There are two things you can change to make a vehicle more resistant to rollover: – Lower the center of gravity – Increase your track width The MICHELIN X One tire does both. ® ® First, the loaded radius of the 445/50R22.5 MICHELIN ® X One XDN 2 tire is 18.7". ® ® A 275/80R22.5 MICHELIN XDN 2 tire (dual ® ® equivalent) loaded radius is 18.9". See chart below. For every inch you lower the Center of Gravity, you gain 3 mph additional safety factor with regard to rollover threshold. Second, the track width is measured at the center of where the load is distributed on the ground. For dual, this would be measured at the center of the space between the dual. For the MICHELIN ® X One ® tire, it is simply measured from the center of the left side tire to the center of the right side tire. As you can see, even though the overall width has reduced, the track width has increased on the MICHELIN ® X One tire. ® ROLLOVER THRESHOLD WITH TIRE SIZE In summary, the MICHELIN X One tire ® ® improves rollover threshold by increasing cornering stiffness, increasing track width, and reducing the center of gravity. These improvements have been validated with: 1) Computer simulation where the whole vehicle is characterized mathematically. 2) Track testing at our internal proving grounds. 3) OE vehicle manufacturers in their independent testing, including tilt table testing. 275/80R22.5 385/65R22.5 425/65R22.5 445/65R22.5 445/50R22.5 Source: Recent evaluations at a MICHELIN facility in South Carolina. 0.42 0.40 0.38 0.36 0.34 0.32 97.9" 80.5" Track Width 2" Outset 101.5" 77.5" Track Width 0" Outset SPECIFICATIONS FOR TREAD DESIGN: MICHELIN X ONE XDN 2 Max. ® ® ® Size 445/50R22.5 Load Range L Catalog Number 36587 Tread Depth 32nds 27 Speed (*) mph 75 Loaded Radius in. 18.7 mm 474 Overall Diameter in. mm 40.4 SPECIFICATIONS FOR TREAD DESIGN: XDN 2 Size ® Load Range 275/80R22.5 (1) G Catalog Number 63465 Tread Depth Max. Speed (*) 32nds mph 27 75 Loaded Radius Overall Diameter Overall Width (‡) in. mm in. mm in. mm 18.9 481 40.6 1030 11.0 279 Approved Rims (Measuring rim listed first.) 8.25, 7.50 1026 Overall Width (‡) in. 17.1 mm 435 Approved Rim 14.00 Per Mile lbs. 515 10200 Revs Max. Load and Pressure Single psi 120 kg. 4625 kPa 830 Min. Dual Spacing (‡) in mm Revs Per Mile Max. Load and Pressure Single lbs. psi kg. kPa Max. Load and Pressure Dual lbs. psi kg. kPa 12.2 311 511 6175 110 2800 760 5675 110 2575 760 60 Operation and Handling Rollover Threshold (g)